21
Published 1991
World Bank

22
by Bayliss, Brian T.
Published 1992
World Bank

23
by Subramanian, Uma
Published 2001
World Bank

24
Published 1996
World Bank

25
by Heggie, Ian Graeme
Published 1998
World Bank

26
by Liu, Zhi
Published 1996
World Bank

27
by Lee, Der-Horng
Published 2004
Edward Elgar

28
by Verhoef, E. T.
Published 2010
Edward Elgar

29
by Bae, Chang-Hee Christine
Published 2008
Edward Elgar

30
by Verhoef, E. T.
Published 2008
Edward Elgar

31
by Levinson, David M.
Published 2002
E. Elgar Pub

32

33
by Ecola, Liisa, Zmud, Johanna, Gu, Kun, Phleps, Peter
Published 2015
RAND

34
by Light, Thomas
Published 2015
RAND Corporation

35
by Borger, Bruno de
Published 2001
Edward Elgar Pub

36
by Sorensen, Paul
Published 2008
RAND Corp.

37
by Hillestad, R. J.
Published 2009
RAND Corp.

38
by Tsang, Flavia, Rohr, Charlene
Published 2011
Rand Corporation

39

40
by Brownell, Peter
Published 2013
RAND